Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

mathstoopidz

2x+7y=-3 -9x+y=46

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. satellite73
    Best Response
    You've already chosen the best response.
    Medals 2

    too many equal signs

    • 2 years ago
  2. satellite73
    Best Response
    You've already chosen the best response.
    Medals 2

    oh my fault i see \[2x+7y=-3\] \[-9x+y=46\] sorry

    • 2 years ago
  3. satellite73
    Best Response
    You've already chosen the best response.
    Medals 2

    you want elimination or substitution ?

    • 2 years ago
  4. mathstoopidz
    Best Response
    You've already chosen the best response.
    Medals 0

    Substitution

    • 2 years ago
  5. satellite73
    Best Response
    You've already chosen the best response.
    Medals 2

    then solve second equation for y, because it is easiest \[-9x+y=46\] \[y=9x+46\] and substitute into first equation

    • 2 years ago
  6. Alexis1994_13
    Best Response
    You've already chosen the best response.
    Medals 0

    2x+7y=-3 (*9) -----> 18x+63y=-27 -9x+y=46 (*2) -----> -18x+2y=92 <=> 65y=65 <=>y=1

    • 2 years ago
  7. Alexis1994_13
    Best Response
    You've already chosen the best response.
    Medals 0

    2x+7*1=-3 => 2x=-10 => x=-5

    • 2 years ago
  8. Alexis1994_13
    Best Response
    You've already chosen the best response.
    Medals 0

    You are welcome :p

    • 2 years ago
  9. satellite73
    Best Response
    You've already chosen the best response.
    Medals 2

    \[2x+7y=-3\] \[2x+7(9x+46)=-3\] \[65x+322=-3\] \[65x=-325\] \[x=-5\]

    • 2 years ago
  10. satellite73
    Best Response
    You've already chosen the best response.
    Medals 2

    the find y by substitution. Alexis got right answer using elimination. doesn't matter which you use

    • 2 years ago
  11. Alexis1994_13
    Best Response
    You've already chosen the best response.
    Medals 0

    We are both great ^^

    • 2 years ago
  12. mathstoopidz
    Best Response
    You've already chosen the best response.
    Medals 0

    Yes, You both are. I just wish I could understand this better... still confused :/

    • 2 years ago
  13. mathstoopidz
    Best Response
    You've already chosen the best response.
    Medals 0

    what would an ordered pair be?

    • 2 years ago
  14. Alexis1994_13
    Best Response
    You've already chosen the best response.
    Medals 0

    Just write what I am writing and if you still have any questions tell me.

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.